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Because helium , neon n argon have a completely filled outer shell n thus require no 
extra electrons. this is also the reason why they were discovered so late.
plz mark brainliest

1 4 1
agree to her.
Element configuration
2. 8. 8. 2.
helium. 2
Neon. 2. 8.
Argon. 2. 8. 8.
now here these elements have completely filled shells..
they don't need any more electron that's why there valence is zero....
0 0 0
please mark it as brainliest if it helped you...
welcome Raksha.....
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